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E6581301
F-67
6
DC voltage
H
ON
Rush current
suppression relay
6.33.21 Motor thermal protection
H
HH
H
~ H
HH
H
: PTC thermal selection
For details, refer to Instruction Manual (E6581339) specified in Section 6.42.
6.33.22 Braking resistance overload curve
H
HH
H
: Braking resistance overload time
Refer to 5.19 for details.
6.33.23
Selection of a restart condition for the motor stopped with a mechanical brake
H
HH
H : Brake-equipped motor restart condition selection
• Function
With this function, the motor can be restarted immediately after a stop if it is operated at a frequency of more
than 10Hz (20Hz or less) and stopped with a mechanical brake.
Use this function only when a mechanical brake is used to stop the motor. Using this function for a motor
without a mechanical brake, the inverter may be tripped or fail.
Title Function Adjustment range Default setting
H
Brake-equipped
motor restart
condition selection
: Default (no waiting time for frequencies of 10Hz and less)
: Conditional (no waiting time for frequencies of 20Hz and
less)
The timing chart in the figure below shows how the motor is operated and stopped with a mechanical brake.
By default, restart waiting time is set to prevent the inverter from being tripped because of the immediate restart of
the motor which started coasting at a frequency of more than 10Hz and stopped (when the ST function is assigned to
the S3 terminal, S3 signal is cut off).
This waiting time, however, is not necessary if a mechanical brake is used to stop the motor more reliably. When
using a mechanical brake to stop the motor, set this parameter H to to allow the motor to restart immediately
after a stop if it started coasting at a frequency of 20Hz or less and stopped.
Ჶ
Ex.
Ჴ
When parameter H is set to .
Ჸ
Starting signal
(S3 and F)
Mechanical brake
Output frequency [Hz]
0
20Hz
Time [s]
[
Note1
]
10Hz
Starting waiting
time
Starting waiting
time
When assigning the ST function to the S3 terminal,
Set
H
to
(to cancel its factory default setting:
= ST always active), and
Set
H
to
(to assign the ST function to the S3 terminal).
Note 1: By default, the restart waiting time shown in the figure is set, and the restart of the motor is delayed by the
time indicated by the dashed line.
Note 2:
If the motor started coasting at a frequency of more than 20Hz, it will restart after the expiration of the waiting time.